Professor Rotenberg is president of the Electronic Privacy Information Center (EPIC). Professor Rotenberg has testified before the US Congress on more than 60 occasions regarding privacy and emerging civil liberties issues. He testified before the 9-11 Commission on "Security and Liberty." He has also spoken before the European Parliament several times and given invited lectures in more than 30 countries. Professor Rotenberg has written more than 50 amicus briefs on privacy and civil liberties for federal and state courts, including three briefs for the Supreme Court in the 2012 term (Clapper v. Amnesty Int'l, Florida v. Harris, and Maracich v. Spears). He has submitted comments in about 100 federal agency rulemakings and similar agency proceedings. He is the co-editor of Information Privacy Law (Aspen Publishing 2006), Technology and Privacy: The New Landscape (MIT Press 1998), The Privacy Law Sourcebook: United States Law, International Law and Recent Developments (EPIC 2005), Litigation Under the Federal Open Government Laws (EPIC 2010), and is on the editorial boards of "BNA Electronic Commerce and Law Report" and "Computer Law and Security Reporter."

Professor Rotenberg is a Fellow of the American Bar Foundation (ABF) and has served on advisory panels for the American Bar Association Section on Criminal Justice, the American Association for the Advancement of Science (AAAS), the Institute of Medicine (IOM), the International Telecommunications Union (ITU), the Internet Corporation for Assigned Names and Numbers (ICANN), the National Academy of Science (NAS), the Organization of American States (OAS), UNESCO, and the OECD. He chairs the ABA Committee on Privacy and Information Protection. He is a former chair of the Public Interest Registry, which manages .ORG domain.

At Stanford Law School, Marc Rotenberg was Articles Editor of the Stanford Law Review, President of the Stanford Public Interest Law Foundation (SPILF), and research assistant for Judge A. Leon Higginbotham, Jr. After law school, he served as Counsel to Senator Patrick J. Leahy on the Senate Judiciary Committee, specializing in law and technology. Professor Rotenberg is a member of the District of Columbia and Massachusetts bar, and the Supreme Court, the D.C. Circuit, First Circuit, Second Circuit, Third Circuit, Fourth Circuit, Fifth Circuit, Sixth Circuit, Seventh Circuit, and Ninth Circuit Courts of Appeal.

Professor Rotenberg is a Fellow of the American Bar Foundation and has received several awards and honors, including the World Technology Award in Law, the American Lawyer Award for Top Lawyers Under 45, the ABA Cyberlaw Excellence Award, the Norbert Weiner Award for Social and Professional Responsibility, and the Vicennial medal from Georgetown University for 20 years of distinguished service.